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// Transformation matrices
uniform mat4 modelViewMatrix;
uniform mat4 normalMatrix;
uniform mat4 projectionMatrix;
uniform mat4 viewMatrix;
// Vertex attributes
attribute vec3 position;
attribute vec3 normal;
attribute vec3 tangent;
attribute vec2 uv;
// Uniforms
uniform sampler2D tNormal;
uniform sampler2D tDisplacement;
uniform float uDisplacementScale;
uniform float uDisplacementBias;
// Varyings
varying vec3 vTangent;
varying vec3 vBinormal;
varying vec3 vNormal;
varying vec2 vUv;
varying vec3 vViewPosition;
void main()
{
vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
vViewPosition = -mvPosition.xyz;
vNormal = normalize(vec3(normalMatrix * vec4(normal, 1.0)));
// tangent and binormal vectors
vTangent = normalize(vec3(normalMatrix * vec4(tangent, 1.0)));
vBinormal = cross( vNormal, vTangent );
vBinormal = normalize( vBinormal );
// texture coordinates
vUv = uv;
// displacement mapping
vec3 dv = texture2D( tDisplacement, uv ).xyz;
float df = uDisplacementScale * dv.x + uDisplacementBias;
vec4 displacedPosition = vec4(vNormal.xyz * df, 0.0 ) + mvPosition;
gl_Position = projectionMatrix * displacedPosition;
vec3 normalTex = texture2D(tNormal, uv).xyz * 2.0 - 1.0;
vNormal = vec3(normalMatrix * vec4(normalTex, 1.0));
}
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